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Strava doesn't use heart rate their justification being there are circumstances such as going steep downhill when your heart rate is high but your exertion low. They'd rather just use your weight, speed, distance and topography to estimate.
I doubt any of the systems have got it right so I tend to use the power of the estimated numbers when I get a conflict.
Mickie_Cricket
HatBeard
I think using a HRM either in the watch or a strap helps as it can use your heart rate to get a better idea of effort.
these days I just wear my fitbit all day and use that to track calorie expenditure and use the garmins (edge & forerunner) to track movement.